# CVE-2026-58014: GNOME GLib off-by-one error in g_key_file_get_locale_string_list

Source: https://junglewise.ai/threats/cve-2026-58014-gnome-glib-off-by-one-error-in-g-key-file-get-locale-string-list  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-30. Updated: 2026-06-30  
License: CC BY 4.0 with a link back

CVE-2026-58014 · Severity: high · CVSS 7.3 · Published 2026-06-30

A security flaw was found in GLib, a core library used by many Linux applications to handle configuration files and basic system tasks. An attacker could provide a specially crafted configuration file (such as a .desktop file) containing an empty value that causes the application to crash or potentially leak small amounts of memory. This could lead to a denial of service for affected applications or system components that process untrusted configuration data.

Technologies: [Gnome Glib](https://junglewise.ai/threats/technologies/glib). Vendors: [Gnome](https://junglewise.ai/threats/vendors/gnome).

## Quick answers

**Is CVE-2026-58014 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58014 being exploited in the wild.

**How severe is CVE-2026-58014?** High severity, with a CVSS score of 7.3, published 30 June 2026.

**Which products and versions are affected?** Gnome Glib 2.6 and later.

**Is there a fix for CVE-2026-58014?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-58014 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-58014?** Check whether you run Gnome Glib at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An off-by-one error exists in the `g_key_file_get_locale_string_list()` function within `glib/gkeyfile.c`. When the function processes a key with an empty string value, `strlen(value)` returns 0. The code subsequently attempts to access `value[len - 1]`, which results in an unsigned integer wrap-around to `SIZE_MAX`. This causes a 1-byte heap buffer under-read (and potentially an under-write if the read byte matches the list separator) before the start of the allocated memory. The vulnerability is reachable if an application uses GLib to parse untrusted `.desktop` or configuration files. Impact includes process crashes (DoS) particularly when memory sanitizers or guard pages are active, and potential 1-byte information disclosure of adjacent heap data.

## Affected products

- GNOME GLib 2.6 and later
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 7
- Red Hat Red Hat Enterprise Linux 6

## Timeline

- 2026-01-30: disclosed: Reported via YesWeHack
- 2026-06-24: other: Reported to Red Hat Bugzilla
- 2026-06-30: advisory: NVD publication date

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-58014](https://access.redhat.com/security/cve/CVE-2026-58014)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2492255](https://bugzilla.redhat.com/show_bug.cgi?id=2492255)
- [https://gitlab.gnome.org/GNOME/glib/-/issues/3930](https://gitlab.gnome.org/GNOME/glib/-/issues/3930)

## Related threats

- [GNOME GLib denial of service in GDBus authentication](https://junglewise.ai/threats/cve-2026-15588-gnome-glib-denial-of-service-in-gdbus-authentication)
- [GNOME GLib out-of-bounds read in D-Bus introspection XML parsing](https://junglewise.ai/threats/cve-2026-58016-gnome-glib-out-of-bounds-read-in-d-bus-introspection-xml-parsing)
- [GLib path traversal in GDBus DBUS_COOKIE_SHA1 authentication](https://junglewise.ai/threats/cve-2026-58015-glib-path-traversal-in-gdbus-dbus-cookie-sha1-authentication)
- [GNOME GLib buffer over-read in g_io_channel_read_line_backend](https://junglewise.ai/threats/cve-2026-58013-gnome-glib-buffer-over-read-in-g-io-channel-read-line-backend)
- [GNOME GLib buffer over-read in g_regex_replace](https://junglewise.ai/threats/cve-2026-58012-gnome-glib-buffer-over-read-in-g-regex-replace)